The science of hair
A general introduction to hair cycles, common changes, and when to seek advice
This page offers general educational information, not a diagnosis, prediction, or treatment plan. Hair shedding and growth timelines vary. A qualified healthcare professional can help assess a personal concern.
Hair grows in cycles
Each hair follicle moves through phases that include active growth, a short transition, rest, and eventual shedding as another hair begins to grow. Follicles do not all move through these phases together, so some daily shedding is a normal part of the cycle.
- Growth: the strand grows from its follicle. This phase can last for years, with duration differing between people and follicles.
- Transition: growth slows and the follicle changes activity.
- Rest: the strand remains in place for a period before shedding.
- Shedding and renewal: an older strand falls and a new growth cycle may begin.
Changes in density, shedding, or the appearance of the scalp can have many possible explanations. A web page or self-assessment cannot identify the cause.
Hair changes can look different
People may notice gradual changes in density or part width, increased shedding after a period of stress or illness, or distinct patches. These patterns can have different causes and should not be self-diagnosed from photographs or online descriptions.
Sudden, persistent, painful, inflamed, or patchy changes are good reasons to seek advice from a dermatologist or another qualified healthcare professional. They can assess your history and recommend appropriate next steps.
A thoughtful approach to hair care
Hair care conversations may include scalp and hair practices, nutrition, wellbeing, and traditional perspectives such as Ayurveda. These are different kinds of information; a traditional framework is not the same as a clinical diagnosis or proof that a product treats a condition.
Choose products based on their labels and directions, consider your own sensitivities, and ask a professional about health questions or persistent symptoms.
Start with useful questions
Noticing when a change began, whether it is gradual or sudden, and what else was happening in your life may help you explain your concern during a professional consultation.
Explore the hair assessment for general reflection only. It does not diagnose a condition or replace individualized professional advice.
Explore the official science page
For Traya’s full published overview, visit the official science page . Product formulations and claims should always be checked against current labels and qualified advice.